Energetics Flashcards

0
Q

What reaction takes in heat and temperature goes down (energy is taken in from surroundings to reaction [products have more energy than reactants])

A

Endothermic

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1
Q

What reaction gives out heat and temperature goes up (energy released from reaction to surroundings [products have less energy than reactants])

A

Exothermic

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2
Q

A reaction between an acid and an alkali is called?

A

Neutralisation

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3
Q

An acid and a carbonate make?

A

CO2

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4
Q

In a … Reaction energy is released from the reaction to surroundings (the products therefore have less energy than reactants)

A

Exothermic

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5
Q

In a … Reaction energy is taken in from surroundings to the reaction (products therefore have more energy than reactants)

A

Endothermic

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6
Q

Combustion and neutralisation are?

A

Exothermic

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7
Q

… reactions have high energy in the reactants and low energy in the products

A

Exothermic

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8
Q

The symbols used for energy (enthalpy) and temperature change in a reaction are?

A

triangle D, and triangle T

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9
Q

… reactions have low energy in the reactants and high energy in the products

A

Endothermic

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10
Q

(S) - solid
(L) - liquid
(G) - gas
(Aq) - aqueous

A

Acids are an aqueous substance

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11
Q

Energy is needed to … Chemical bond

A

Break

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12
Q

Energy is given out when bonds are?

A

Made

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13
Q

Define bond energies

A

The energy needed to break a chemical bond

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14
Q

Bonds - Bonds
Broken Made

1370 - 1856

A

-486 KJ/mole (KJmol-1) = exothermic

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15
Q

Energy change =

A

Bonds broken - bonds made

16
Q

X/y axis of an exo/endothermic reaction

A

Cause of reaction

Energy

17
Q

Energy values have the units of

A

KJ/mole (KJmol-1)

18
Q

Complete some exercises and questions on bond making, breaking and energy change calculations

A

Workbook

19
Q

It takes … Kilo joules of energy to raise one … Of water by … Kelvin. One Kelvin is equal to … Degrees celsius.

A

One
Gram
One
One

20
Q

Negative value =

Positive value =

A

Exothermic

Endothermic

21
Q

Q = m x c x triangleT

A

Energy released= mass of water x specific heat capacity of water x change in temperature
(-ve = exothermic and vice versa)